
/**
 * Copyright 2009 cestum.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.waveprotocol.wave.model.operation.wave {
import org.waveprotocol.wave.model.document.operation.BufferedDocOp;
import org.waveprotocol.wave.model.document.operation.algorithm.DocOpInverter;
import org.waveprotocol.wave.model.document.operation.impl.DocOpBuffer;
import org.waveprotocol.wave.model.operation.OperationException;
import org.waveprotocol.wave.model.util.Preconditions;
import org.waveprotocol.wave.model.wave.data.WaveletData;

/**
 * Comments same as wave-protocols'
 * Operation class for an operation that will modify a document within a given wavelet.
 */
public final class WaveletDocumentOperation extends WaveletOperation {
	private var documentId:String;
	private var operation:BufferedDocOp;
	
	
	public function WaveletDocumentOperation(documentId:String, operation:BufferedDocOp) {
		Preconditions.checkNotNull(documentId, "Null document id");
		Preconditions.checkNotNull(operation, "Null document operation");
		this.documentId = documentId;
		this.operation = operation;
	}
	
	public function getDocumentId():String {
		return documentId;
	}
	
	public function getOperation():BufferedDocOp {
		return operation;
	}
	
	
	override protected function doApply(target:WaveletData):void  {
		target.modifyDocument(documentId, operation);
	}
	
	
	override public function getInverse():WaveletOperation {
		var inverse:DocOpInverter= new DocOpInverter(new DocOpBuffer());
		operation.apply(inverse);
		return new WaveletDocumentOperation(documentId, BufferedDocOp(inverse.finish()));
	}
	
	
	public function toString():String {
		return "WaveletDocumentOperation(" + documentId + "," + operation + ")";
	}
}
}